Heating-furnace.



No. 802,295. PATENTED OCT. 17, 1905. F. KERNAN.

HEATING FURNACE.

APFLIGATION FILED JUNE 12, 1903.

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WITNESSES:

PATENTED OUT. 17, 1905.

F. KERNAN.

HEATING FURNACE,

APPLICATION FILED JUNE 12, 1903,

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Specification of Letters Patent.

Patented Oct. 17, 1905.

Application filed June 12,1903. Serial No. 161,138.

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Be it known that I, FRANCIS KIQRNAN, a citizen of the United States,residing at Utica, in the county of Oneida and State of New York, haveinvented new and useful Improvements in Heating-Furnaces, of which thefollowing is a specification.

My invention relates to a heating-furnace, particularly adapted forburning soft or bituminous coal, and has for its object to sup ply tothe fire and mix with the products of combustion a sufficient amount ofheated air, so that the smoke and products are consumed.

The invention consists in constructing the fire-door on its innersurface with an air-chamber into which the air is admitted and heatedand is then distributed downwardly onto the surface of the fire.

My invention will be understood by reference to the drawings herewith,in which the reference-numerals of the specification indicate thecorresponding parts in allthe figures.

Figure I is a front elevation of the furnace with portions broken away.Fig. II is a ver tical section at right angles to the preceding. Fig.III is an elevation of the inside of the feed-door enlarged. Fig. 1V isa vertical sec tion at right angles to the preceding. Fig. V is a topplan thereof. Figs. VI and VII are respectively elevation and bottomplan of the flue-plate detached. Fig. VIII is a vertical section throughone of the fines thereof.

In the drawings, 1 indicates the fire-box; 2, the dome; 3, the .iiues;4:, the ash-pit; 5, the ash-pit door; 6, the grate; 7, the dustflue; 8,thedust-damper; 9, the hand-hole; 10, the jacket, and 11 the clean-outdoor, of usual construction.

20 is the feed-door, having inlet 21 and inlet-damper 22, suitablyregulate l, as best shown in Fig. I, to admit a greater or less amountof air to the air-chamber 23, having contracted throat 24, formed bysecuring to the inside of the door the chamber-plate 26, preferablyvertically corrugated to give a greater heating-surface.

In the fire-box of the furnace is secured the flue-plate 28, formed withthe fines 29, having their inner ends inclined slightly downwardly andso arranged that when the firedoor is closed it makes a tight joint withthe flange 31. Above the lire-box and supported thereon is the dome 40,which with the fire-box forms the combustion-chamber I1 outside thedome, and between it and the fecd-door is arranged the mouthpiece 42,which may be made integral with the dome, if desired.

By my construction the air in a regulable amount enters the air chamberor reservoir in the door where it is held momentarily to be heated, andthence through the throat or outlet of the reservoir contracted to givea good draft is distributed or sprayed in a downward current uniformlyover substantially the Whole liresurface, so as to be thoroughly mixedwith the products of combustion and unconsumed gases, supplyingsufficient oxygen to consume all such products, avoiding smoke, andeconomizing fuel.

My invention is simple and economical to manufacture, is easily attachedto various forms of furnaces, and has the great advantagethat there arefew joints and connections, and all such joints are entirely inside thefurnace and none of them in the air-chamber formed by the jacket aroundthe furnace, so that in case of accidental leak there is no danger ofgases escapii'ig into the house; but they are all retained within thefurnace and are consumed to pass up to the chimney with the remainder ofthe gases. \Vhile particularly adapted for use with soft coal, yet thefurnace so constructed may be used with anthracite, preferably thesmaller sizes, and other fuels.

I do not limit myself to the exact construc tion here shown, for theform may be varied without departing from the spirit of my invention.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. In a heating-furnace, the combination with the furnace and thefeed-door, of a vertically-corrugated chamber-plate secured to the innerface of the door forming an enlarged air-chamber provided with an inletin its upper portion through the door, a damper to said inlet, afinishing-plate secured to the door and fitted to the lower portion ofthe chamber-plate, to form a contracted throat and an outlet from theair-chamber, the flue-plate arranged within the lire-box and providedwith substantially horizontal and downwardlyeurved flues adapted toregister with the airchamber outlet, and a flai'ige on the chamberplateto make substantially a tight joint with the flue-plate, when the dooris closed.

2. In a heating-furnace. the combination with the furnace, of thefeed-door provided with an air-chamber on its inner face, said chamberhaving an inlet through the door and an outlet to the fire, and asubstantially horizontal flue-plate to receive in its flues the heatedair from the chamber and to distribute it into the products ofcombustion over the surface of the fire, said flues having their in nerends inclined slightly downwardly, said flue-plate being arrangedentirely within the mouth and outside of the combustion-chamber,substantially as described and shown.

3. In a heating-furnace, the combination with the feeddoor, of achamber-plate secured to the inner face of the door forming an enlargedair-heating chamber in its upper portion and a contracted throat alongits lower margin, the door being provided with an air-inlet'into theupper portion of the chamber, an inlet-damper to control the air flowingin through the inlet, and a flue-plate arranged in the bottom of themouthpiece and entirely within the mouthpiece, the flue-plate beingformed with a series of flues adapted to register with the throat attheir outer ends, the outer portions of the lines being substantiallyhorizontal.

4. In a heating-furnace, the combination with the feed-door, of achamber-plate secured to the inner face of the door forming an enlargedair-heating chamber in its upper portion and a contracted throat alongits lower margin, the door being provided with an air-inlet into theupper portion of the chamber, an inlet-damper to control the air,flowing in through the inlet, and a flue-plate arranged in the bottomof the mouthpiece and entirely within the mouthpiece, the flue-platebeing formed with a series of flues adapted to register with the throatat their outer ends, the outer portions of the flues being substantiallyhorizontal, and the .inner ends of the flu es being inclined slightlydown, to distribute the infiowing heated air over substantially theentire surface of the fire, to mix with the prodnets of combustion.

5. As a new article of manufacture, a separable flue-plate adapted to bearranged in the bottom of the mouthpiece of a heating-furnace, saidflue-plate being formed with a concave inner margin, the metal adjacentto said inner margin beinginclined slightly down and the plate providedwith a series of parallel ribs extending from its outer to its innermargin, forming flues when the plate is set in position.

In testimony whereof I have sign ed my name to this specification in thepresence of two subscribing witnesses.

FRANCIS KERNAN.

Witnesses:

G. C. SoHoENEoK, M. E. GAGON.

